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PDF TB62731FU Data sheet ( Hoja de datos )
| Número de pieza | TB62731FU | |
| Descripción | Step up DC-DC converter for LEDs | |
| Fabricantes | Toshiba | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de TB62731FU (archivo pdf) en la parte inferior de esta página. Total 9 Páginas | ||
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TOSHIBA
TB62731FU
TOSHIBA BiCD INTEGRATED CIRCUIT SILICON MONOLITHIC
TB62731FU
Step up DC-DC converter for LEDs
FEATURES
• The new driver incorporates a Pulse Current Drive Mode that raises
efficiency over 90% while driving up to six white LEDs in a serial
connection.
• In Direct Current Drive Mode white LEDs can be driven with very
low noise and efficiencies over 85%.
• The TB62731FU uses bi-cadmium (BiCD) process technology. This
new methodology allows for a reduction in the external component
SOT23 6pin
count therefore lowering costs and improving battery life.
• Newly developed temperature derating technology predicts environmental temperature, including heat
dissipating from the driver IC itself, and adjusts current to optimize light emission.
• Ultra compact 6-pin SOT23 package.
• Ability to drive all wavelengths and materials.
• +3.0V to +5.5V supply voltage
• Adjustable output current (Up to 320mW output power) 20mA driving current can be supply for LEDs with
16V total Vf
• Internal switching MOSFET (1.5 ohm typ)
• Shutdown function
• TOSHIBA is continually working to improve the quality and reliability of its products. Nevertheless, semiconductor devices in general can malfunction or fail due to
their inherent electrical sensitivity and vulnerability to physical stress. It is the responsibility of the buyer, when utilizing TOSHIBA products, to comply with the
standards of safety in making a safe design for the entire system, and to avoid situations in which a malfunction or failure of such TOSHIBA products could cause
loss of human life, bodily injury or damage to property.
• In developing your designs, please ensure that TOSHIBA products are used within specified operating ranges as set forth in the most recent TOSHIBA products
specifications. Also, please keep in mind the precautions and conditions set forth in the “Handling Guide for Semiconductor Devices,” or “TOSHIBA
Semiconductor Reliability Handbook” etc..
• The TOSHIBA products listed in this document are intended for usage in general electronics applications (computer, personal equipment, office equipment,
measuring equipment, industrial robotics, domestic appliances, etc.). These TOSHIBA products are neither intended nor warranted for usage in equipment that
requires extraordinarily high quality and/or reliability or a malfunction or failure of which may cause loss of human life or bodily injury (“Unintended Usage”).
Unintended Usages include atomic energy control instruments, airplane or spaceship instruments, transportation instruments, traffic signal instruments,
combustion control instruments, medical instruments, all types of safety devices, etc. Unintended Usage of TOSHIBA products listed in this document shall be
made at the customer’s own risk.
• The products described in this document are subject to the foreign exchange and foreign trade laws.
• The information contained herein is presented only as a guide for the applications of our products. No responsibility is assumed by TOSHIBA CORPORATION for
any infringements of intellectual property or other rights of the third parties, which may result from its use. No license is granted by implication or otherwise under
any intellectual property or other rights of TOSHIBA CORPORATION or others.
Available from:
Marktech Optoelectronics
120 Broadway • Menands, NY 12203
800.984.5337 FAX: 518.432.7454
Website: www.marktechopto.com
Email: [email protected]
The information contained herein is subject to change without notice.
1 page  
TOSHIBA
TB62731FU
Operational Description
TB62731FU is a pulse-skipping converter that uses a combined control scheme of voltage feedback
loop and current limited feedback loop to operate constant LED driving current. Operation can be easily
understood by referring to the Block Diagram and Switching Waveforms.
The internal MOSFET is turned on when amplifier A senses that the average voltage at R_sens is lower
than REF level. The N-channel MOSFET stays “turned on” until either the switching current peak
reaches 220mA(typ), or the oscillator automatically turns it off at its maximum on-duty (83.3%). Once
turned off, the MOSFET keeps off during the off-time. Subsequently, if the R_sens voltage is still lower
than reference level, another switching cycle is started. Otherwise, the internal MOSFET remains turned
off as long as the average R_sens voltage is higher than reference level.
[Shutdown Mode]
The TB62731FU falls into shutdown mode, when SHDN=”L”. In shutdown mode, the reference, control
circuitry, oscillator and internal switching MOSFET are stopped and current consumption is reduced
below 0.5uA. Connect SHDN to “VCC” for normal operation.
Switching Waveforms Illustration
V(A)
Inductor
current
I(A)
220 mA
LED
current
Average
Current
OSC
Fs=360 kHz
on-duty(max)=83.3%
Preset LED current level
Available from:
Marktech Optoelectronics
120 Broadway • Menands, NY 12203
800.984.5337 FAX: 518.432.7454
Website: www.marktechopto.com
Email: [email protected]
The information contained herein is subject to change without notice.
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet TB62731FU.PDF ] | |
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